The first important exposition in the United States was held in Philadelphia in 1876.
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All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
Formulatedin1823,theMonroeDoctrineassertedthattheAmericaswerenolongeropentoEuropeancolonization.
ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
Amythical(imaginary)creature,thedragonwasbelievedtohavelion'sclaws,scalyskin,andfierybreath.
Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.